My M-17 winches are Lewmar 6s. All the dimensions can be found online at the Mauripro sailing website. The base diameter is 3 11/ 16; the overall height is 3 1/4. Rick M-17 #633 Lynne L ************** Download the AOL Classifieds Toolbar for local deals at your fingertips. (http://toolbar.aol.com/aolclassifieds/download.html?ncid=emlcntusdown0000000...)